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Consider two aligned, parallel, square planes (0.4 m × 0.4 m) spaced 0.8 m apart and maintained atT1 = 500 K and T2 =800 K. Calculate the net radiative heat transfer from surface 1 for the following special conditions:
(a) Both planes are black, and the surroundings are at 0 K.
(b) Both planes are black with connecting, reradiating walls.
(c) Both planes are diffuse and gray with å1 = 0.6, å2 = 0.8, and the surroundings at 0 K.
(d) Both planes are diffuse-gray (å1 = 0.6 and å2 =0.8) with connecting, reradiating walls.
R2 000 is invested at 10% per annum compounded half-yearly. After three months, the interest rate changes to 12% per annum compounded monthly. Find the value of the investment after two years.
Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13.
A new car is designed to run a mean of at least 50 000 kilometers before its first tune-up. Tests with 30 cars show a sample mean of 49 500 kilometers and a sample standard deviation of 1000 kilometers.
Determine the point estimate of difference between mean fuel efficiency rating for midsize cars and large cars? Calculate p-value for the hypothesis test.
Do you think Mindas data collection method is good in general and If you were going to give advises on the data collection method, what would be your suggestions?
according to some research males have better spatial skills than do females and according to other research females
Use normal disrtibution of fish lengths for which the mean is 8 inches and the standard deviation is 5 inches. Assume the variable x is normally distributed.
A tv weat man reports a 35% chance of rain today. What is the probability that it will not rain today? Explain
a researcher is studying the weight changes that women go through over the course of pregnancy childbirth and
The hospital was 12.0 weeks with the standard deviant of 1.0 week. Out of 100 patients, how many would you expect to stay longer than 13 weeks?
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
An article in Psychology and Marketing describes four variables that have been found to impact the effectiveness of commercials for high-performance auto- mobiles:
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